Can i put a air intake in a 2005 Ford Focus ZX4?

Can i put a air intake in a 2005 Ford Focus ZX4?

You can do it

I don't know, can you?
Are you allowed?
Do you know how to?

Okay guys if you don't know any thing about cars then don't answer

I don't know can you? Is it your car? Why do you want to do this? Do you like wasting money for the sake of it? What are your gains/means for doing this? What do you hope to achieve from doing this?

Not without removing the much better intake the factory put on it.

It will not have a positive effect, but it may make fuel economy and emissions worse